BaseTools: Fix MSVC AARCH64 Building of tools. (#1597)

Latest MSVC update started wanring on zero extending of ~. Add explicit
casts to fix AARCH64 build errors.

Errors can be viewed in #1587 when attempting to build tools for AARCH64
using MSVC.

- [ ] Impacts functionality?
- [ ] Impacts security?
- [ ] Breaking change?
- [ ] Includes tests?
- [ ] Includes documentation?

Local build to reproduce the errors.
Local build succeeds after changes.

No integration necessary.

Author: apop5

BaseTools/Source/C/GenFfs/GenFfs.c

@@ -398,7 +398,7 @@ Routine Description:
     // Based on section type to adjust offset? Todo
     //
     if ((InputFileAlign [Index] != 0) && (((Size + HeaderSize + TeOffset) % InputFileAlign [Index]) != 0)) {
-      Offset = (Size + sizeof (EFI_COMMON_SECTION_HEADER) + HeaderSize + TeOffset + InputFileAlign [Index] - 1) & ~(InputFileAlign [Index] - 1);
+      Offset = (Size + sizeof (EFI_COMMON_SECTION_HEADER) + HeaderSize + TeOffset + InputFileAlign[Index] - 1) & ~(UINTN)(InputFileAlign[Index] - 1);
       Offset = Offset - Size - HeaderSize - TeOffset;
 
       if (FileBuffer != NULL && ((Size + Offset) < *BufferLength)) {

BaseTools/Source/C/GenSec/GenSec.c

@@ -538,7 +538,7 @@ Routine Description:
       // make sure section data meet its alignment requirement by adding one raw pad section.
       //
       if ((InputFileAlign [Index] != 0) && (((Size + HeaderSize + TeOffset) % InputFileAlign [Index]) != 0)) {
-        Offset = (Size + sizeof (EFI_COMMON_SECTION_HEADER) + HeaderSize + TeOffset + InputFileAlign [Index] - 1) & ~(InputFileAlign [Index] - 1);
+        Offset = (Size + sizeof (EFI_COMMON_SECTION_HEADER) + HeaderSize + TeOffset + InputFileAlign[Index] - 1) & ~(size_t)(InputFileAlign[Index] - 1);
         Offset = Offset - Size - HeaderSize - TeOffset;
 
         if (FileBuffer != NULL && ((Size + Offset) < *BufferLength)) {